Posted by charles todd on February 12, 2011 at 00:51:23 from (205.242.95.136):
In Reply to: exhaust pipe diameter posted by Justin SE IOWA on February 10, 2011 at 17:16:21:
My 5.3L has dual cats that Y into a 3" pipe (all stock at this point) then to the muffler (a 3" in/3"out x 18" glass pack) out of a Y to dual 2 1/4" or 2 1/2" tail pipes capped with 4" tips. I believe this is a "Cat-Back" system? It was like this when I bought it. It has a deep rumble but doesn't "POP" like duals due to the Y config. I like the deep and the rumble and the not too loud. I do not like the "POP-POP" of true duals.
Honestly I have been told and read up that on a "V" engine a Y or balance pipe should be in place to equalize the pulses from the combustion to scavenge the exhaust from the engine. I have had trucks with true duals and truck with Y config's. The true duals did not seem to run as smooth. And as others said 2 1/2" duals are overkill. That is good for at least 400hp.
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